Upper limits on DM annihilation cross sections from the first AMS-02 antiproton data
Abstract
The first measurement on the antiproton to proton ratio made by the AMS-02 collaboration agrees with the expection from conventional cosmic-ray secondaries in the kinetic energy range 10-100 GeV, which can be turned into stringent upper limits on the dark matter (DM) annihilation cross sections above 300 GeV. Using the GALPROP code, we derive the upper limits in various propagation models and DM profiles. We show that in the "conventional" propagation model, for the q q, b b, and WW final states, the constraints can be more stringent than that derived from the recent Ferm-LAT gamma-ray data on the dwarf spheroidal satellite galaxies. Making use of the typical minimal, median and maximal models obtained from a previous global fit, we show that the variation of the upper limits is around a factor of five. The possibility of DM contribution to the high energy p/p data is discussed.